Abstract
Purpose
The aim of this study was to compare the results of whole-body diffusion-weighted magnetic resonance (DW-MR) imaging with staging based on computed tomography (CT) and nuclear scintigraphy using Tc99m results as the standard of reference.
Methods and materials
Seventeen patients with known malignant tumours were included in the study. The thorax and the abdomen were imaged using breath-hold diffusion-weighted imaging and T1-weighted imaging sequences in the coronal plane. Location and size of osseous metastases were documented by two experienced radiologists. Whole-body DW-MR imaging findings were compared with results obtained at skeletal scintigraphy and CT bone survey.
Results
The mean examination time for whole-body DW-MR imaging was 25.5 min. All bone metastases regardless of the size were identified with whole-body DW-MR imaging; MR imaging depicted more bone metastases than CT. Skeletal scintigraphy depicted osseous metastases in 13 patients (with greater sensitivity to the lower limb), whereas whole-body DW-MR imaging revealed osseous metastases in 13 patients (with greater sensitivity to the spine). DW-MR did not show good results for detection of rib cage metastases. The additional osseous metastases seen with MR imaging were confirmed at follow-up examinations and some had a change in therapy. MR identified 22 % more metastatic lesions when compared to bone scintigraphy and 119 % when compared to CT. Bone scintigraphy identified 80 % more metastatic lesions when compared to CT. On a per-patient basis, whole-body DW-MR imaging revealed sensitivity and specificity values of 100 %.
Conclusion
Whole-body DW-MR imaging was more sensitive in the detection of osseous metastases than were skeletal scintigraphy and CT bone survey.
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Conflict of interest
Riccardo Del Vescovo, Giulia Frauenfelder, Francesco Giurazza, Claudia Lucia Piccolo, Roberto Luigi Cazzato, Rosario Francesco Grasso, Emiliano Schena, Bruno Beomonte Zobel declare no conflict of interest.
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Del Vescovo, R., Frauenfelder, G., Giurazza, F. et al. Role of whole-body diffusion-weighted MRI in detecting bone metastasis. Radiol med 119, 758–766 (2014). https://doi.org/10.1007/s11547-014-0395-y
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DOI: https://doi.org/10.1007/s11547-014-0395-y